Lead-pencil



G. E. BERGEN.

LEAD PENCIL.

APPLICATION FILED MAR. I9. 19Is.

Patented Nov. 23, 1920..-

rao

GEORllE B.' BERGEN, 0F CHICAGG, ILLINOS, ASSFGNOR, E?? 'MESNEASSIGNMENTS, TO

AUTOPOINT PJENCXL COMPANY, OF CHXCAGU, ILLINXS, A CRFORATIN F ELLI- 1d"01S.

LEAD-FENCJIL.

ttltd.

Application lled March i9,

To all whom t may concern.

Be it known that l, GEORGE B. BERGEN, a citiren of the United States,and resident of Chicago, in the county of Cook and tate of lllinois,have invented certain newv and useful -lmprovements in Lead-Pencils, ofwhich the -following is a speciiication.

My invention relates to lead pencils and particularly to an improvedpencil of simplified design from the standpoint of manufacture.

The objects of this invention may briefly be stated to be the provisionof a compact lead propelling mechanism in which use is made of tworelatively rotatable parts, one of which travels away from the other,there being means for preventing an excess ol' torsion such as mightcause a bending or breaking of either part. lt will furtherv appear thatthe pencil ot' this invention may be very cheaply constructed and beoperated with certainty under all normal conditions of use. due to itsimproved and novel features of construction.

rlfhe invention will be more readily understood by reference to theaccompanying drawing, wherein, y

Figure 1 is a longitudinal sectional view through a pencil constructedin accordance with my invention;

Fig. 2 is an elevation, partly in section, showing the plunger andfiller;

Fig. 3 is an enlarged sectional View on the line 3-'-3 of Fig. 1;

Fig. d is a similar View on the line 4.-4 0f Fig. l, y

Fig. 5 is a similar view on the line 5--5 of 2, and

F ig. 6 is a sectional view similar to Fig.

4, showing, however, a plunger of 'triangular, instead of flat crosssection.

ln the drawings it will be seenI that the body 1() of the pencil isprovided with a longitudinal axial opening 11, of substantially uniformsize from end to end thereof. ln the pointed end of the pencil ll-xedlymount a cylindrical liller 12, which is pref-` erably composed of arelativel soft mate' rial such as papier mch. he extreme point 13, ofthe pencil is preferably composed oit hard rubber or similar material.The papier mch ller is provided with an axial opening substantial-ly thesize of the lead 14e, and because ot the nature of the Specification ofLetters Patent.

Patented Nov. 23, 120.

1918. Serial life. dll.

material the lead will be trictionally held therein irrespective otslight variations in the diameters ot diiderent leads.

At its inner end the liller 12, is provided with a cap or metallicmember l5, which is iirmly fixed to the filler, the cap being .providedwith a slot 16, of substantially the size of the flat, threaded plunger17. rllhe-edges of the plunger are threaded, the threads beingpreferably formed by stamping or pressing. lt will be noted that theplunger is uniform from end to end thereof and that the same tits snuglywithin the slot 16, Y formed in the end ofthe cap 15. The plunger isadvanced by reason ot its engagement with the threads 18, formed in theend of the rotatable sleeve 19,. and the end of the sleeve and the `cap15, are substantially in contact. By reason ot this arrangement there isno. tendency to twist the plun er which is likely to occur where thethrea ed sleeve and the means for preventing rotation of the plunger areseparated to any material extent. rlhe points being in such closeproximity the operation is without interference or binding. lt will benoted also that theopening 20, in the threaded sleeve is of a diametersubstantially equal to the widthaot the plunger and therefore that theplunger is-.fmaintained in perfect alinement in all positions. rlhis islikewise true of the lead opening in the filler, the plunger bein-galinefd and maintained substantially in contact at all points in thelength of the opening. There is therefore no opportunit for the plungerto wabble or become twiste The rotatable sleeve is securely lixedat itsouter end tc a head 21, which as shown in Fig. 3, isprovided withnotches 22, 1n its periphery, into which a portion of the Collar 23, ispressed to maintain the parts in nonrotative engagement. The collar islikewise crimped into engagement with the body by means of the rmgs 24,the collar having the capacity for rotation on the body in a well knownmanner. A rubber eraser 25, may be located in the extension of thecollar if desired.

lt will be seen that the rotation of the collar 23, will have the e'ectet reciprocatin the dat plunger 17, and that the lead wil be advanced asrequired. The means ter holding the lead at pointsi throughout itslength assures that it willv not be easily broken. l have found that oneof the prolic causes of the breakage of lead is because the lead is notsecurely held at all .points in its length.

In the construction of Fig. 6, the body 25, and sleeve 26, remain thesame. `'lhe plunger 27, however, is of triangular instead of flat crosssectional shape, the corners or angles carrying the threads instead ofthe edges as in the iat plunger. The operation is the same as heretoforedescribed.

AVarious other modifications may be made in the structure shown and suchmodifications I considery within the spirit of my invention.

I claim:

l. A pencil having a hollow body containing atone end a filler in whichis an axial opening to receive therein a lead and plunger for advancingthe same, an apertured cap fixedly arranged at one end of the .fillerand having walls in iush relation with those of the lfiller, and aplunger having means for effecting propulsion thereof longitudinally ofthe body and through the cap to expel the lead from the pencil, theplunger being -ornied to cooperate with the aperture in the cap totravel-therethrough without rotation, substantially as described.

2. A pencil having a hollow body containing at one endv a filler inwhich is an `axial opening to receive therein a lead and plunger foradvancingthe saine7 an apertured cap ixedly arranged at one end of thefiller having side walls in Hush relation with those oll the iller, athreaded plunger adapted to travel through the aperture et prising arotatable sleeve having its inner end adjacent the cap and being formedinteriorly at that end with threads which cooperate with the plungerthreads whereby the plunger is advanced with rotation of the sleeve,substantially as described.

3. A pencil having a hollow body containing at' one end a filler inwhich is an axial opening to receive therein a lead and plunger loradvancing the same, an apertured cap fxedly arranged at one end of theiller, a flat plunger adapted to move longitudinally of the body andthrough the aperture in the cap and opening in the filler7 the edges ot'the plunger being threaded, and a sleeve rotatably arranged within thepencil having.

its inner end adjacent the cap and being formed at that end withinternal threads adapted to cooperate with the threads on the plungerwhereby the plunger is advanced longitudinally of the pencil withrotation of the sleeve, the aperture in the cap being of a size andshape to receive the plunger without permitting its rotation therein,substan tially as described.

Signed at Chicago, of March, Y1918.

minors, this 14th day oponen n. BERGEN.

Tlli/'itness t T. Bn'rnnn,

